Improvement in bark-mills



0. P. RYTHER. Bark-Mill.

No. 220,945. Patented Oct. 28, 1879.

N was NPETEJis, PMOTU-LITHOGRAFHER. WASNINGwN. D. c,

UNITED-STATES PATENT OFFICE,

CHARLES P. RYTHER, OF OARTHAGE, NEW YORK.

IMPROVEMENT IN BARK-MILLS.

Specification forming part of Letters Patent No. 220,945, dated October28, 1879 application filed June 16, 1879.

To all whom it may concern." Be it known that 1, CHARLES 1. RYTHER, ofCarthage, county of Jefferson, and State v of New York, have invented anew and useful Improvement in Mills and Appliances for Crushing,Grinding, and DisintegratingBarks and Dried Vegetable Substances orDrugs,

of which the following is a specification.

-in each view, Figure 1 is a horizontal plan view from above, and Hi g.2 a vertical section taken through thecenter of the mill.

A A is a hopper-shaped shell, forming the body of the mill proper, andprovided with ears at K K, by which the same may be securely fastened tosuitable timbers in the floor.

Running across the body of this shell, about midway of its depth, arethe supports B B, which unite at the'center in the hub B. Depending fromthese supports are a number of annular rings, 0 O, the peculiar form ofwhose vertical section is that of a couple of truncated cones set baseto base, the lower cone being much the shorter.

D is a stirrup-hanger attached to the shell A A, and carrying the sleeveE, through which passes the driving-shaft F. To the latter is firmlyattached the armed clutch G, which engages with suitable lugs on theunder side of the arms H H, and to whose upper sides are attached theseries of annular rings, I I, the outline of whose vertical section isthat of a cone with the base resting on the arm H.

The sloping faces of each of the series of annular rings 0 G and I I areserrated, as are also the surfaces of the lower portion of the interiorof the shell A A and the exterior of the hub B, which extendsdown withinthe annular rings I I, and whose outline is similar to that of the rings0 O. The lower edges of the latter are furnished with studs orprojections at J. 7

The center or hub of the arms H H is formed into a sort of sleeve, whichpasses up into a corresponding opening in the lower part of the hub B.Above the hub B a heavy horizontal arm, L, is firmly keyed to the shaftF. This arm has projections upon its lower face, which, when in motion,run just free of the arms B B.

The shaft F, at its lower end, is supposed to have a bearing in asuitable step, which is so constructed that it can be raised or lowered,as may be desired, and by which the opposing faces of the annular rings0 O and I I may be adjusted as to the distance between the same, thusproviding for the character, as to size, of the material as it comesfrom the mill.

Operation: The step or bearing upon which the shaft F revolves beingproperly adjusted so as to bring the faces of the lower parts of therings 0 G and I I in proper position, motion is imparted to the shaft F,which, in turn, revolves the arm L and the clutch G. The latter engagesthe lugs upon the under side of the arms H H, which carry the rings I I.The material to be ground is throwu,in coarsely-broken pieces, into thetop of the shell A A, where it first comes in contact with the revolvingarm L. The projections upon the under side catch the bark, and partlycrush it as they pass the arms B B, from between which it drops betweenthe rings 0 O and I I. The upper edges of the latter have some sharpprojecting points, (not discernible in the drawings,) which furtherserve to break the material before it comes in contact with the opposing serrated surfaces of the annular rings. The latter, from their shape,gradually approximate each other in their vertical outline, until thepoint shown by the horizontal line 00 is reached, and from the abrasionof these surfaces and their serrations the bark or other material ismore fully broken or ground as it descends.

In use it is found that the dust of the mill will impact itself quitefirmly at the bases of theringsI Ionthearms HH. The little studs J onthe lower edges of the rings 0 O serve as cleaners for these spaces.

Having thus described my invention, and disclaiming the generalconstruction of the .body of the mill as not novel, what I do claim asnew, and desire to secure by Letters Patent is- Iii a mill for thereduction and grinding of bark, the stationary annular grindin g-rin gsO 0, provided upon their lower edges with the clearing studs orprojections J, in combination with the arms H H, carrying the runner-rings I I, as and for the purpose set forth.

CHAS. P. RYTHER.

Witnesses:

GEO. W. MORROW, J. 0. House.

